Add support for Deno

[Hajime-san]

This PR adding the support for Deno as a package manager.

NOTE: Like the command deno run build fallbacks to scripts in pacakge.json or tasks in deno.json.

compressed-size-action/src/index.js

Lines 62 to 64 in 66325aa

	startGroup(`[current] Build using ${packageManager}`);
	console.log(`Building using ${packageManager} run ${buildScript}`);
	await exec(`${packageManager} run ${buildScript}`);

https://github.com/denoland/deno/blob/11db67aaa38dd552925c49d519bbc754fd3104f5/cli/lib.rs#L377-L381
https://github.com/denoland/deno/blob/11db67aaa38dd552925c49d519bbc754fd3104f5/cli/tools/task.rs#L57

[rschristian]

Cheers